Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D223/00—Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom
  • C07D223/14—Heterocyclic compounds containing seven-membered rings having one nitrogen atom as the only ring hetero atom condensed with carbocyclic rings or ring systems
  • C07D223/16—Benzazepines; Hydrogenated benzazepines
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/14—Drugs for disorders of the nervous system for treating abnormal movements, e.g. chorea, dyskinesia
  • A61P25/16—Anti-Parkinson drugs
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/18—Antipsychotics, i.e. neuroleptics; Drugs for mania or schizophrenia
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/28—Drugs for disorders of the nervous system for treating neurodegenerative disorders of the central nervous system, e.g. nootropic agents, cognition enhancers, drugs for treating Alzheimer's disease or other forms of dementia
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P3/00—Drugs for disorders of the metabolism
  • A61P3/04—Anorexiants; Antiobesity agents
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D243/00—Heterocyclic compounds containing seven-membered rings having two nitrogen atoms as the only ring hetero atoms
  • C07D243/06—Heterocyclic compounds containing seven-membered rings having two nitrogen atoms as the only ring hetero atoms having the nitrogen atoms in positions 1 and 4
  • C07D243/10—Heterocyclic compounds containing seven-membered rings having two nitrogen atoms as the only ring hetero atoms having the nitrogen atoms in positions 1 and 4 condensed with carbocyclic rings or ring systems
  • C07D243/14—1,4-Benzodiazepines; Hydrogenated 1,4-benzodiazepines
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D267/00—Heterocyclic compounds containing rings of more than six members having one nitrogen atom and one oxygen atom as the only ring hetero atoms
  • C07D267/02—Seven-membered rings
  • C07D267/08—Seven-membered rings having the hetero atoms in positions 1 and 4
  • C07D267/12—Seven-membered rings having the hetero atoms in positions 1 and 4 condensed with carbocyclic rings or ring systems
  • C07D267/14—Seven-membered rings having the hetero atoms in positions 1 and 4 condensed with carbocyclic rings or ring systems condensed with one six-membered ring

Definitions

• New compounds process for their preparation, intermediates, pharmaceutical compositions and their use in the treatment of 5-HT6 mediated disorders such as Alzheimer's disease, cognitive disorders, cognitive impairment associated with schizophrenia, obesity and Parkinson's disease.
• the present invention relates to new compounds, to pharmaceutical compositions containing said compounds and to the use of said compounds in therapy.
• the present invention further relates to processes for the preparation of said compounds and to the use of intermediates in the preparation thereof.
• Serotonin (5-hydroxy-tryptamine) (5-HT) receptors play an important role in many physiological and pathological functions like anxiety, sleep regulation, aggression, feeding and depression.
• the 5-HT receptors are distributed throughout the body and can be divided into seven different 5-HT receptor subtypes, i.e. 5-HT1 - 5-HT7, with different properties.
• the 5-HT6 receptor is mostly found in the central nervous system (CNS). From in situ hybridization studies it is known that the 5-HT6 receptor in rat brain is localized in areas like striatum, nucleus accumbens, olfactory tubercle and hippocampal formation (Ward et al, Neuroscience, 64, p 1105-1111, 1995).
• 5-HT6 antagonists increase levels of glutamate and aspartate in the frontal cortex and dorsal hippocampus as well as acetylcholine in the frontal cortex. These neurochemicals are known to be involved in memory and cognition (Dawson et al., Neuropsychopharmacology., 25(5), p 662-668, 2001) (Gerard et al., Brain Res., 746, p 207-219, 1997) (Riemer et al J Med Chem 46(7), p 1273-1276, 2003).
• Acetylcholinesterase inhibitors increase the levels of acetylcholine in the CNS and are used in the treatment of cognitive disorders such as Alzheimer's disease. 5-HT6 antagonists may therefore be used in the treatment of cognitive disorders.
• 5-HT6 antagonist increases the level of dopamine and noradrenaline in the medial prefrontal cortex (Lacroix et al. Synapse 51, 158-164, 2004).
• 5-HT6 receptor antagonists have been shown to improve performance in the attentional set shifting task (Hatcher et al. Psychopharmacology 181(2):253-9, 2005). Therefore, 5-HT6 ligands are expected to be useful in the treatment of disorders where cognitive deficits are a feature, such as schizophrenia.
• Several antidepressants and atypical antipsychotics bind to the 5-HT6 receptor and this may be a factor in their profile of activities (Roth et al., J. Pharm. Exp.
• 5-HT6 modulators have described the potential use of 5-HT6 modulators in the treatment of epilepsy.
• 5-HT6 receptors have also been linked to generalized stress and anxiety states (Yoshioka et al., Life Sciences, 62,
• 5-HT6 agonists have been shown to elevate levels of GABA in brain regions associated with anxiety and shown positive effects in models predictive of obsessive-compulsive disorder (Schechter et al. NeuroRx. 2005 October; 2(4): 590-611). The use of modulators for this receptor is therefore expected for a wide range of CNS disorders.
• 5-HT6 receptor modulators may therefore also be useful in the treatment of feeding disorders like anorexia, obesity, bulimia and similar disorders and also type 2 diabetes.
• the object of the present invention is to provide compounds exhibiting a modulating activity at the 5-hydroxy-tryptamine 6 receptor.
• the present invention provides compounds of formula I
• Q is C 6-1 oarylCo -6 alkyl, C 5-11 heteroarylCo -6 alkyl, C 3-7 cycloalkylCo -6 alkyl, C 3-
• R 1 is hydrogen, hydroxyl, halogen, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, C 1-6 alkoxy, N(R 8 ) 2 ,
• B is O, N(R 5 ), or B is N in a C 5-11 heteroaryl
• X is O, CH 2 Or NR 10 ;
• R 2 is hydrogen, hydroxyl, halogen, C 1-6 alkyl, C 1-6 alkoxy, C 1-6 haloalkyl, C 1-6 haloalkylO, R 9 OC 0-6 alkyl, CN, SR 8 , SO 2 R 9 , SOR 9 , N(R 8 )COR 9 , N(R 8 )SO 2 R 9 , COR 9 , COOR 9 , OSO 2 R 9 ,
• R 3 is hydrogen, C 1-: ⁇ oalkyl, C ⁇ haloalkyl or R 9 OC ⁇ . 6 alkyl;
• R 4 is hydrogen, C 1-5 alkyl, C 1-5 haloalkyl, C 1-S aIkOXy or Ci-shaloalkoxy and may be substituted by one or more groups selected independently from halogen, hydroxyl, cyano,
• R 3 and R 4 form together a C ⁇ heterocycloalkyl, which may be substituted by one or more groups selected independently from hydrogen, halogen, C 1-6 alkyl, C 1-6 haloalkyl, COR 9 ,
• R 5 is hydrogen, C 1-6 alkyl, R 9 OC 1-6 alkyl, C 1-6 haloalkyl or C 1-6 cyanoalkyl;
• R 6 is C 1-6 alkyl, C 6 - lo arylCo- 3 alkyl, Cs-eheteroarylCo ⁇ alkyl, C 3-7 cycloalkylC 0-3 alkyl or C 1 .
• R 7 is hydrogen, C 1-6 alkyl, C 1-6 haloalkyl, C 3-7 cycloalkylC 0-3 alkyl, C 6-10 arylCo -3 alkyl or C 5-
• R 6 and R 7 form together a C 5-6 heteroaryl or C 3-7 heterocycloalkyl, whereby any aryl and heteroaryl under R 1 , R 6 and R 7 may be substituted by one or more groups selected independently from hydrogen, halogen, hydroxyl, C 1-6 haloalkyl, CN, OR , C 1-6 alkyl, oxo, SR 8 , CON(R 8 ) 2 , N(R 8 )COR 9 , SO 2 R 9 , SOR 9 , N(R 8 ) 2 and COR 9 ;
• R 8 is hydrogen, C 1-6 alkyl, C 1-6 cyanoalkyl or C 1-6 haloalkyl
• R 9 is Ci -6 alkyl, Ci ⁇ cyanoalkyl or C 1-6 haloalkyl
• R 8 and R 9 form together a C ⁇ heterocycloalkyl which may be substituted by one or more groups selected independently from hydrogen, halogen, hydroxyl, C ⁇ alkyl, C 1-3 alkoxy and cyano; and
• R 10 is H, Ci- ⁇ alkyl, C ⁇ haloalkyl, COR 11 or SO 2 R 11 ; or salts, solvates or solvated salts thereof.
• R 1 is hydrogen, halogen, C 1-6 alkyl, C 6-lo arylCo -3 alkyl, C 5-6 heteroarylCo -3 alkyl, C 1- ehaloalkyl, CN or R 6 OC 0-6 alkyl; n is 1 or 2;
• B is O or N(R 5 );
• X is O, CH 2 or NR 10 ;
• R 2 is hydrogen, hydroxyl, halogen, C 1-6 alkyl, Ci- ⁇ haloalkyl, C 1-6 haloalkylO;
• R 3 is hydrogen, C 1-10 alkyl, C 1-6 haloalkyl or R 9 OC 1-6 alkyl;
• R 4 is hydrogen, Ci-salkyl, C 1-5 haloalkyl, C ⁇ salkoxy or C 1-5 haloalkoxy and may be substituted by one or more groups selected independently from halogen, hydroxyl, cyano, C 1-3 alkyl and C 1-3 alkoxy, or
• R 3 and R 4 form together a C 3-7 heterocycloalkyl, which may be substituted by one or more groups selected independently from hydrogen, halogen, C 1-6 alkyl, C 1-6 haloalkyl, COR 9 ,
• R 5 is hydrogen, C 1-6 alkyl, C 1-6 haloalkyl or C ⁇ cyanoalkyl; or salts, solvates or solvated salts thereof.
• Q is C 6-10 arylC 0-6 alkyl
• R is halogen; n is 1 or 2;
• B is O or N(R 5 );
• X is O, CH 2 Or NR 10 ;
• R 2 is hydrogen or halogen
• R 3 is hydrogen or C 1-10 alkyl
• R 4 is hydrogen or C 1-5 alkyl, or
• R 3 and R 4 form together a C 3-7 heterocycloalkyl
• R 5 is hydrogen; or salts, solvates or solvated salts thereof.
• R 1 is hydrogen, halogen, C ⁇ alkyl, C 6- 10 arylC 0-3 alkyl, C 5-6 heteroarylC 0-3 alkyl, C 1-6 haloalkyl, CN or R 6 OC 0-6 alkyl.
• R 1 is a halogen such as chloro, bromo, iodo and fluoro.
• R 1 is methyl, ethyl, propyl, butyl or pentyl.
• a further embodiment of the invention relates to compounds selected from the group consisting of:
• alkyl includes both straight and branched chain alkyl groups and may be, but are not limited to methyl, ethyl, n-propyl, i- propyl, n-butyl, i-butyl, s-butyl, t-butyl, n-pentyl, i-pentyl, neo-pentyl, n-hexyl, i-hexyl, etc.
• CMoalkyl having 1 to 10 carbon atoms may be but are not limited to methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, s-butyl, fert-butyl, n-pentyl, i-pentyl, neo-pentyl, etc..
• 'Co' means a bond or does not exist. For example when "arylCoalkyl” is equivalent with “aryl”, "C 2 alkylOC 0 alkyl” is equivalent with "C 2 alkylO".
• alkenyl includes both straight and branched chain alkenyl groups.
• C 2 - 6 alkenyl having 2 to 6 carbon atoms and one or two double bonds, may be, but is not limited to vinyl, allyl, propenyl, butenyl, crotyl, pentenyl, hexenyl, and a butenyl group may for example be buten-2-yl, buten-3-yl or buten-4-yl.
• alkynyl includes both straight and branched chain alkynyl groups.
• C 2 - 6 alkynyl having 2 to 6 carbon atoms and one or two trippel bonds, may be, but is not limited to etynyl, propargyl, pentynyl or hexynyl and a butynyl group may for example be butyn-3-yl or butyn-4-yl.
• cycloalkyl refers to an optionally substituted, partially or completely saturated cyclic hydrocarbon ring system.
• C 3-7 CyClOaUCyI may be, but is not limited to cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl or cyclopentenyl.
• alkoxy refers to radicals of the general formula -O-R, wherein R is selected from a hydrocarbon radical.
• the term “Cr ⁇ alkoxy” may include, but is not limited to methoxy, ethoxy, propoxy, isopropoxy, butoxy, t-butoxy, isobutoxy, cyclopropylmethoxy, allyloxy, propargyloxy, pentoxy, isopentoxy, etc.
• amine or “amino” refers to radicals of the general formula -NRR', wherein R and R' are selected independently from hydrogen or a hydrocarbon radical.
• 'N(R 5 )' refers to a group wherein R 5 may the same or different.
• heterocycloalkyl denotes a non-aromatic, partially or completely saturated hydrocarbon group, which contains one ring and at least one heteroatom.
• heterocycle examples include, but are not limited to pyrrolidinyl, pyrrolidonyl, piperidinyl, piperazinyl, morpholinyl, oxazolyl, 2-oxazolidonyl or tetrahydrofuranyl.
• aryl refers to an optionally substituted monocyclic or bicyclic hydrocarbon ring system with at least one unsaturated aromatic ring.
• examples of “aryl” may be, but are not limited to phenyl, naphthyl or tetralinyl.
• heteroaryl refers to an optionally substituted monocyclic or bicyclic hydrocarbon ring system with at least one unsaturated ring and containing at least one heteroatom selected independently from N, O or S.
• heteroaryl may be, but are not limited to pyridyl, pyrrolyl, furyl, thienyl, imidazolyl, oxazolyl, isoxazolyl, thiazolyl, pyrazolyl, benzofuryl, indolyl, isoindolyl, benzimidazolyl, pyridazinyl, pyrimidinyl, pyrazinyl, tetrazolyl, triazolyl, quinazolinyl or isotiazolyl.
• a C 5 heteroaryl refers to a 5 membered aromatic ring system containing at least one heteroatom.
• arylalkyl and “heteroarylalkyl” refer to a substituent that is attached via the alkyl group to an aryl or heteroaryl group.
• haloalkyl means an alkyl group as defined above, which is substituted with halo as defined above.
• C 1-6 haloalkyl may include, but is not limited to fluoromethyl, difluoromethyl, trifluoromethyl, fluoroethyl, difluoroethyl or bromopropyl.
• C 1-6 haloalkylO may include, but is not limited to fluoromethoxy, difluoromethoxy, trifluoromethoxy, fluoroethoxy or difluoroethoxy.
• the present invention relates to the compounds of formula I as hereinbefore defined as well as to the salts, solvates or solvated salts thereof.
• Salts for use in pharmaceutical compositions will be pharmaceutically acceptable salts, but other salts may be useful in the production of the compounds of formula I.
• a suitable pharmaceutically acceptable salt of the compounds of the invention is, for example, an acid-addition salt, for example a salt with an inorganic or organic acid.
• a suitable pharmaceutically acceptable salt of the compounds of the invention is an alkali metal salt, an alkaline earth metal salt or a salt with an organic base.
• Other pharmaceutically acceptable salts and methods of preparing these salts may be found in, for example, Remington's Pharmaceutical Sciences (18 th Edition, Mack Publishing Co.).
• Some compounds of formula I may have chiral centres and/or geometric isomeric centres (E- and Z- isomers), and it is to be understood that the invention encompasses all such optical, diastereoisomeric and geometric isomers.
• the invention also relates to any and all tautomeric forms of the compounds of formula I.
• a transformation of a group or substituent into another group or substituent by chemical manipulation can be conducted on any intermediate or final product on the synthetic path toward the final product, in which the possible type of transformation is limited only by inherent incompatibility of other functionalities carried by the molecule at that stage to the conditions or reagents employed in the transformation.
• Such inherent incompatibilities, and ways to circumvent them by carrying out appropriate transformations and synthetic steps in a suitable order will be readily understood to the one skilled in the art of organic synthesis. Examples of transformations are given below, and it is to be understood that the described transformations are not limited only to the generic groups or substituents for which the transformations are exemplified.
• a compound B may be prepared from a compound A using reductive amination.
• A may be mixed with a carbonyl compound such as an aldehyde or a ketone in the presence of a reducing agent such as sodium borohydride, sodium cyanoborohydride, sodium triacetoxyborohydride or hydrogen in the presence of a suitable catalyst such as for example described in "Advanced Organic Chemistry, Reactions, Mechanisms and Structure", J. March, John Wiley & Sons, New York, 1992.
• An acid such as formic acid or acetic acid may be added to control the pH of the reaction.
• the reaction may be performed in a solvent such as water, methanol, ethanol, dichloromethane, THF, formic acid, acetic acid or mixtures thereof at temperatures between 0°C and the reflux temperature of the solvent, preferably at room temperature.
• a solvent such as water, methanol, ethanol, dichloromethane, THF, formic acid, acetic acid or mixtures thereof at temperatures between 0°C and the reflux temperature of the solvent, preferably at room temperature.
• the reaction mixture may be either worked up by extraction and then purified by column chromatography or the reaction mixture may be concentrated and purified by column chromatography.
• a compound B is dissolved in a solvent such as THF, dioxane or DMF and a base such as sodium hydride or sodium methoxide is added.
• the reaction may be performed at temperatures between room temperature and the reflux temperature of the solvent for reaction times between 1 and 24 h.
• the product may be isolated by extraction, precipitation or column chromatography.
• a compound B may be dissolved in a solvent such as DMF, THF or dichloromethane or mixtures thereof.
• a phosphine compound such as triphenylphosphine or tributylphosphine and an activating agent such as diethyl azodicarboxylate or diisopropyl azodicarboxylate are added, preferably at temperatures between -10°C and room temperature.
• the reaction may be performed at temperatures between -15°C and the reflux temperature of the solvent, preferably at room temperature for reaction times between 1 and 24 h.
• the product may be isolated by extraction, precipitation or column chromatography.
• Step 3 A compound C may be transformed into a compound D by chlorosulfonylation.
• compound C may be dissolved in a solvent such as dichloromethane, chloroform or ethyl acetate and cooled to between -72 0 C and O 0 C.
• the reaction may also be run neat in chlorosulfonic acid.
• Chlorosulfonic acid optionally diluted in a solvent such as chloroform, may be added dropwise while cooling.
• the reaction may be stirred for 10 min- 1 h while cooling and then let to room temperature or heated to the reflux temperature of the solvent for 1-100 h, typically for 1-5 h.
• a chlorinating agent such as thionyl chloride may be added to the reaction mixture.
• the reaction may be quenched by adding the reaction mixture to ice water, optionally containing a base such as sodium bicarbonate and the raw product may be isolated by extraction and used without further purification or if stable enough, purified by column chromatography.
• the crude may be dissolved in a solvent such as chloroform or toluene and a chorinat ⁇ ng agent such as thionyl chloride or oxalyl chloride may be added.
• a catalytic amount of DMF may be added and the mixture may be heated to between 25 0 C and the reflux temperature of the solvent. The workup and purification may be performed as in the previous section.
• the same reaction conditions may be used for the transformation of a compound G to a compound H or a compound L to a compound M.
• a compound Ia may be prepared by the reaction of a compound D with a compound of formula E.
• a compound D may be reacted with a compound E in the presence of an organic base such as pyridine, triethylamine or diisopropylethylamine or an inorganic base such as sodium hydroxide or potassium carbonate in a solvent such as dichloromethane, chloroform, acetonitrile, DMF, THF or mixtures thereof at a temperature between 0 0 C and the reflux temperature of the solvent, preferably at room temperature.
• the product may be isolated by column chromatography or by extraction followed by column chromatography. The same procedures may be used to transform a compound H into a compound J or a compound M into a compound Ic.
• Step 5 A compound F may be transformed into a compound G via the Schmidt rearrangement.
• Compound F and sodium azide may be dissolved in a solvent such as benzene, TFA or acetic acid.
• Sulfuric acid may be added at temperatures below 5°C, typically between - 1O 0 C and 5°C.
• the reaction may be performed at temperatures between room temperature and the reflux temperature of the solvent.
• the mixture may then be poured onto ice or water and the mixture may be made basic with a base such as ammonia, potassium carbonate or sodium hydroxide.
• the mixture may be stirred at room temperature for 1-20 h and the product may be isolated by extraction, precipitation or column chromatography.
• Step 6 The reduction of compound J to compound Ib may be performed with a reducing agent such as borane or lithium aluminum hydride in a solvent such as tetrahydrofuran or diethyl ether at temperatures between 0°C and the reflux temperature of the solvent, preferably between 25°C and the reflux temperature.
• a reducing agent such as borane or lithium aluminum hydride
• a solvent such as tetrahydrofuran or diethyl ether
• the product may be isolated by column chromatography or by extraction. The same procedures may be used to transform a compound G into a compound K.
• a compound K may be transformed into a compound L using standard protecting groups.
• Conventional procedures for using such protecting groups, as well as examples of suitable protecting groups are described in, for example, "Protective Groups in Organic Synthesis” T.W. Green, P.G.M. Wuts, Wiley-Interscience, New York, 1999.
• a compound Ic2 where R 3 is not H may be prepared from a compound IcI where R 3 is H by alkylation with a compound R 3 Y 2 where Y 2 may be a suitable leaving group such as a halogen, mesylate or triflate, such as for example described in "Comprehensive Organic Transformations, a Guide to Functional Group Preparation", R. C. Larock, John Wiley & sons, New York, 1999.
• a solvent such as DMF, ethanol, dichloromethane or toluene
• the reaction may be performed at temperatures between 25°C and the reflux temperature of the solvent and the reaction time may be between 1 and 100 hours.
• the reaction mixture may be either worked up by extraction and then purified by column chromatography or the reaction mixture may be concentrated and purified by
• reaction temperature may be elevated above the reflux temperature of the solvent and reaction times shortened by the use of microwave heating.
• a compound Ic2 may be prepared from a compound IcI using reductive amination.
• compound IcI may be mixed with a carbonyl compound such as an aldehyde or a ketone in the presence of a reducing agent such as sodium borohydride, sodium cyanoborohydride, sodium triacetoxyborohydride or hydrogen in the presence of a suitable catalyst such as for example described in "Advanced Organic Chemistry, Reactions, Mechanisms and Structure", J. March, John Wiley & Sons, New York, 1992.
• An acid such as formic acid or acetic acid may be added to control the pH of the reaction.
• the reaction may be performed in a solvent such as water, methanol, ethanol, dichloromethane, THF, formic acid, acetic acid or mixtures thereof at temperatures between 0°C and the reflux temperature of the solvent, preferably at room temperature.
• a solvent such as water, methanol, ethanol, dichloromethane, THF, formic acid, acetic acid or mixtures thereof at temperatures between 0°C and the reflux temperature of the solvent, preferably at room temperature.
• the reaction mixture may be either worked up by extraction and then purified by column chromatography or the reaction mixture may be concentrated and purified by column chromatography.
• a compound Ic2 may also be prepared from a compound IcI by first preparing the amide or carbamate followed by reduction using an appropriate reducing agent.
• the amide may for example be prepared by reaction of IcI with an acid chloride or with a carboxylic acid in the presence of a coupling reagent, such as for example described in "Comprehensive Organic Transformations, a Guide to Functional Group Preparation", R. C. Larock, John Wiley & sons, New York, 1999.
• the carbamate may be prepared by the reaction of an alkylchloroformate with a compound IcI in a solvent such as dichloromethane in the presence of a base such as triethylamine or pyridine at temperatures between 0°C and the reflux temperature of the solvent.
• the reduction of the carbamate or the amide may be performed with a reducing agent such as lithium aluminum hydride in a solvent such as tetrahydrofuran or diethyl ether at temperatures between O 0 C and the reflux temperature of the solvent, preferably between 25 °C and the reflux temperature.
• a reducing agent such as lithium aluminum hydride in a solvent such as tetrahydrofuran or diethyl ether at temperatures between O 0 C and the reflux temperature of the solvent, preferably between 25 °C and the reflux temperature.
• the reduction of the amide may also be performed using borane as the reducing agent.
• Another embodiment relates to the use of the compound of formula Ml in the preparation of compounds of formula I.
• a pharmaceutical composition comprising as active ingredient a therapeutically effective amount of the compound of formula I, or salts, solvates or solvated salts thereof, in association with one or more pharmaceutically acceptable diluents, excipients and/or inert carriers.
• the composition may be in a form suitable for oral administration, for example as a tablet, pill, syrup, powder, granule or capsule, for parenteral injection (including intravenous, subcutaneous, intramuscular, intravascular or infusion) as a sterile solution, suspension or emulsion, for topical administration e.g. as an ointment, patch or cream, for rectal administration, e.g. as a suppository, or for inhalation.
• parenteral injection including intravenous, subcutaneous, intramuscular, intravascular or infusion
• a sterile solution e.g. as an ointment, patch or cream
• rectal administration e.g. as a suppository, or for inhalation.
• compositions may be prepared in a conventional manner using one or more conventional excipients, pharmaceutical acceptable diluents and/or inert carriers.
• Suitable daily doses of the compounds of formula I in the treatment of a mammal, including man, are approximately 0.01 to 250 mg/kg bodyweight at peroral administration and about 0.001 to 250 mg/kg bodyweight at parenteral administration.
• the typical daily dose of the active ingredient varies within a wide range and will depend on various factors such as the relevant indication, severity of the illness being treated, the route of administration, the age, weight and sex of the patient and the particular compound being used, and may be determined by a physician.
• the compounds of formula I are expected to be suitable for the treatment of disorders relating to or affected by the 5-HT6 receptor including cognitive, personality, behaviour, psychiatric and neurodegenerative disorders.
• Examples of such disorder may be selected from the group comprising of Alzheimer's 30 disease anxiety, depression, convulsive disorders such as epilepsy, personality disorders, obsessive compulsive disorders, migraine, cognitive disorders such as memory dysfunction, sleep disorders, feeding disorders such as anorexia, obesity, bulimia, panic attacks, withdrawal from drug abuse, schizophrenia, cognitive impairment associated with schizophrenia, attention deficit hyperactive disorder (ADHD), attention deficit disorder (ADD), dementia, memory loss, disorders associated with spinal trauma and/or head injury, stroke, diabetes type 2, binge disorders, bipolar disorders, psychoses, Parkinson's disease, Huntington's disease, neurodegenerative disorders characterized by impaired neuronal growth, and pain.
• ADHD attention deficit hyperactive disorder
• ADD attention deficit disorder
• dementia memory loss
• disorders associated with spinal trauma and/or head injury stroke
• diabetes type 2 binge disorders
• bipolar disorders psychoses
• Parkinson's disease Huntington's disease
• neurodegenerative disorders characterized by impaired neuronal growth, and pain.
• gastro-intestinal disorders such as gastroesophageal reflux disease (GERD) and irritable bowel syndrome (IBS).
• GERD gastroesophageal reflux disease
• IBS irritable bowel syndrome
• the compounds may also be used for treatment of tolerance to 5-HT6 activators,
• One embodiment of the invention relates to the compounds of formula I as hereinbefore defined, for use in therapy.
• Another embodiment of the invention relates to the compounds of formula I as hereinbefore defined, for use in treatment of 5-HT6 mediated disorders.
• a further embodiment of the invention relates to the compounds of formula I as hereinbefore defined, for use in treatment of Alzheimer's disease.
• Another embodiment of the invention relates to the compounds of formula I as hereinbefore defined, for use in treatment of cognitive disorders such as for example cognitive impairment associated with schizophrenia.
• Yet a further embodiment of the invention relates to the compounds of formula I as hereinbefore defined, for use in treatment of obesity.
• One embodiment of the invention relates to the compounds of formula I as hereinbefore defined, for use in treatment of Parkinson's disease.
• Another embodiment of the invention relates to the use of the compounds of formula I as hereinbefore defined, in the manufacture of a medicament for treatment of 5-HT6 mediated disorders, Alzheimer's disease, cognitive disorders, cognitive impairment associated with schizophrenia, obesity and/or Parkinson's disease, and any other disorder mentioned above.
• a further embodiment of the invention relates to a method of treatment of 5-HT6 mediated disorders, Alzheimer's disease, cognitive disorders, cognitive impairment associated with schizophrenia, obesity and/or Parkinson's disease, and any other disorder mentioned above, comprising administering to a mammal, including man in need of such treatment, a therapeutically effective amount of the compounds of formula I, as hereinbefore defined.
• Yet another embodiment of the invention relates to a pharmaceutical composition
• a pharmaceutical composition comprising a compound of formula I as hereinbefore defined, for use in treatment of 5- HT6 mediated disorders, Alzheimer's disease, cognitive disorders, cognitive impairment associated with schizophrenia, obesity and/or Parkinson's disease, and any other disorder mentioned above.
• One embodiment of the invention relates to an agent for the treatment of 5-HT6 mediated disorders, Alzheimer's disease, cognitive disorders, cognitive impairment associated with schizophrenia, obesity and/or Parkinson's disease, and any other disorder mentioned above, which comprises as active ingredient a compound of formula I as hereinbefore defined.
• therapy and “treatment” includes prevention and prophylaxis, unless there are specific indications to the contrary.
• the terms “treat”, “therapeutic” and “therapeutically” should be construed accordingly.
• inhibitor and “antagonist” mean a compound that by any means, partly or completely, blocks the transduction pathway leading to the production of a response by the agonist.
• the compounds according to the present invention are modulators of the 5-HT6 receptors, and may be inhibitors, as well as agonists, inverse-agonists or partial-agonist.
• disorder means any condition and disease associated with 5-HT6 receptor activities.
• the compounds of formula I, or salts, solvates or solvated salts thereof are also useful as pharmacological tools in the development and standardisation of in vitro and in vivo test systems for the evaluation of the effects of modulators of 5-HT6 related activity in laboratory animals such as cats, dogs, rabbits, monkeys, rats and mice, as part of the search for new therapeutics agents.
• the mass spectrometer was scanned between m/z 100-700 with a scan time of 0.3s. Separations were performed on either Waters X-Terra MS C8 (3.5 ⁇ m, 50 or 100 mm x 2.1 mm i.d.) or an ACE 3 AQ (100 mm x 2.1 mm i.d.) obtained from ScantecLab. Flow rates were regulated to 1.0 or 0.3 mL/min, respectively. The column temperature was set to 40 °C.
• a linear gradient was applied using a neutral or acidic mobile phase system, starting at 100% A (A: 95:5 10 niM NH 4 OAcMeCN, or 95:5 8 mM HCOOH:MeCN) ending at 100% B (MeCN).
• mass spectra were recorded on a Waters LCMS system (Sample Manager 2777C, 1525 ⁇ binary pump, 1500 Column Oven, ZQ, PDA2996 and ELS detector, Sedex 85). Separation was performed using a Zorbax column (C8, 3.0 x 50 mm, 3 ⁇ m) supplied by Agilent Tehcnologies. A four minutes linear gradient was used starting at 100 % A (A: 95:5 10 mM NH 4 OAcMeOH) and ending at 100% B (MeOH). The ZQ was equipped with a combined APP I/ APCI ion source and scanned in the positive mode between m/z 120-800 using a scan time of 0.3 s.
• the APPI repeller and the APCI corona were set to 0.86 kV and 0.80 ⁇ A, respectively.
• the desolvation temperature (300 0 C), desolvation gas (400 L/Hr) and cone gas (5 L/Hr) were constant for both APCI and APPI mode;
• GC-MS analysis was performed on a GC-MS (GC 6890, 5973N MSD) supplied by Agilent Technologies.
• the column used was a DB-5 MS, ID 0.25 mm x 30m, 0.25 ⁇ m.
• a linear temperature gradient was applied starting at 40 0 C (hold 1 min) and ending at 300 °C (hold 1 min), 25 °C/minute.
• the MS was equipped with a CI ion source and the reactant gas was methane.
• the MS was scanned between m/z 50-500 and the scan speed was set to 3.25 scan/s.
• mass spectra EI-DI
• microwave heating was performed in a Creator, Initiator or Smith Synthesizer Single-mode microwave cavity producing continuous irradiation at 2450 MHz;
• Example 5 iV-(4-Chloro-l-naphthyl)-2,3,4,5-tetrahydro-l,4-benzoxazepine-7-sulfonamide The method described in example 3(i) was used to prepare the title compound (0.3 mg, 0.3 %).
• Striatal tissue from adult rats (Sprague-Dawley, 320-370 g, B & K Sweden) were dissected out, weighed and homogenized in buffer containing 50 mM Tris-HCl, 4 mM MgC12, 1 mM EDTA, 10 ⁇ M pargyline and protease inhibitor (Complete, Roche Diagnostics) pH 7.4 using an Ultra-Turrax T8 (IKlA Labortechnik, Germany).
• the tissue homogenate was centrifuged at 48 000xg for 10 min and the pellet was resuspended and recentrifuged as above.
• the final membranes were diluted in buffer to a concentration of 60 mg original wet weight (w.w.) per ml and stored in aliquots at -70°C.
• Typical IC 50 values as measured in the assays described above are 5 ⁇ M or less. In one aspect of the invention the IC 50 is below 500 nM. In another aspect of the invention the IC 50 is below 50 nM. In a further aspect of the invention the IC 5O is below 10 nM.

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